单项选择题

Directions: In this section you will hear two mini-talks. At the end of each talk, there will be some questions. Both the talks and the questions will be read to you only once. After each question, there will be a pause. During the pause, you must choose the best answer from the four choices given by marking the corresponding letter with a single bar across the square brackets on your machine-scoring Answer Sheet.

A. 18-21.
B. 22-25.
C. 3O-5O.
D. 70-80.